Docvalues benefits is the reason we recommend them by default (and
non-text fields now do have docvalues by default).
They do have some drawbacks however:
 - Require reindexing
 - Take up more index space
 - Slower than FieldCache

So although the majority will be better served by docvalues, I don't
think there should be a rush to remove the option of using the
FieldCache.

-Yonik

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